Talk:Sea mark

It should be mentioned that the direction of tides is what determines the placement of buoys. Fionnlaoch (talk) 18:16, 16 August 2008 (UTC)

The placement of buoys may happen along tidal channels, that's right. But what do you mean by "direction" of tides? De728631 (talk) 18:26, 16 August 2008 (UTC)

The placing of the green and red marker buoys is determined by the direction of the rising tide. Between Ireland and Britain, for example, the tide rushes north when rising. This therefore determines on which side the green and red buoys are (IALA A in this case, so green is to starboard as you look north).

In the case of a port, the rising tide generally moves into the port and therefore under IALA A, the green marker should be kept to starboard as you enter the port.

In the case of an island, where the tide moves around it as it rises, there will be a change over point on the far side, which will be marked on charts. —Preceding unsigned comment added by 86.47.40.18 (talk) 13:56, 4 November 2010 (UTC)

According to IALA, this is only one side of the medal. The full regulation reads as follows [1]:

"The 'conventinal direction of bouyage', which must be indicated in appropriate nautical documents, may be either:

2.1.1 The general direction taken by the mariner when approaching a harbour, river estuary or other waterway from seaward, or

2.1.2 The direction determined by the proper authority in consultation, where appropriate with neighbouring countries. In principle it should follow a clockwise direction around landmasses."

So officially tides don't play any significant role but Britain and Ireland may have an agreement to use them for marking directions. Elsewhere it is done differently and e.g. in German manuals you learn that the direction to a port or river estuary is what defines the direction, regardless of rising tide. If you can provide a source that connects tides to the origin of the above named conventions then let's add that. Add to that the fact that e.g. in the central Baltic Sea you don't have any tides at all. De728631 (talk) 19:49, 4 November 2010 (UTC)

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